<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <el-alert title="添加商品信息" type="info" show-icon :closable="false" center></el-alert>
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form
        ref="addFormRef"
        :model="addForm"
        label-width="80px"
        :rules="addFormRules"
        label-position="top"
      >
        <el-tabs
          @tab-click="tabClicked"
          tab-position="left"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price" type="number">
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight" type="number">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="good_cat">
              <el-cascader
                expand-trigger="hover"
                :options="cateList"
                :props="cateProps"
                v-model="addForm.goods_cat"
                @change="handleChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 属性表示上传后端地址 -->
            <!-- ! upload 组件使用自己的 AJAX,所以我们需要为其手动添加 headers -->
            <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce" ref="editorRef"></quill-editor>
            <el-button type="primary" class="addItemBtn" @click="addItem">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="imgUrl" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash";
export default {
  data() {
    return {
      activeIndex: "0",
      cateList: [],
      onlyTabData: [], // 静态属性面板数据
      manyTabData: [], // 动态参数面板数据
      imgUrl: "",
      previewVisible: false,
      headerObj: { Authorization: window.sessionStorage.getItem("token") }, // 图片上传的 headers 请求头对象
      cateProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        attrs: [],
        pics: [], // 图片数组
        goods_introduce: ""
      },
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "please select a item", trigger: "blur" }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 3, pagenum: 1, pagesize: 5 }
      });
      if (res.meta.status !== 200) {
        return this.message.error("获取分类参数失败");
      }
      this.cateList = res.data.result;
    },

    // 级联选择器变化
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },

    // 标签页切换行为
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择三级商品分类!");
        return false;
      }
      // ! 最后代码为 return false; 会阻止标签页切换，但先前的代码依旧会执行
    },

    // Tab点击事件
    async tabClicked() {
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.addForm.goods_cat[2]}/attributes`,
          {
            params: { sel: "many" }
          }
        );
        if (res.meta.status !== 200) {
          return this.message.error("获取动态参数列表失败!");
        }
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(",");
        });
        this.manyTabData = res.data;
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.addForm.goods_cat[2]}/attributes`,
          {
            params: { sel: "only" }
          }
        );
        if (res.meta.status !== 200) {
          return this.message.error("获取静态属性失败");
        }
        this.onlyTabData = res.data;
      
      }
    },

    // 处理图片预览效果
    handlePreview(file) {
      this.imgUrl = file.response.data.url;
      this.previewVisible = true;
    },

    // 处理图片删除效果
    handleRemove(file) {
      const filePath = file.response.data.tmp_path;
      const i = this.addForm.pics.findIndex(x => {
        x.pic === filePath;
      });
      this.addForm.pics.splice(i, 1);
    },

    // 监听图片上传成功事件
    handleSuccess(response) {
      // * 拼接图片信息对象
      const picInfo = { pic: response.data.tmp_path };
      // ** push 图片信息对象到 pics 数组
      this.addForm.pics.push(picInfo);
   
    },

    // 添加商品
    // ! 基本信息标签页的所有为 0 的数据我们要赋值才能提交成功
    addItem() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项!");
        }

        // 深拷贝 addForm(使用外部 lodash 库)
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");

        // 处理动态参数和静态属性
        this.manyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ")
          };
          this.addForm.attrs.push(newInfo);
        });
        this.onlyTabData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vlas };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        const { data: res } = await this.$http.post("goods", form);
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败!");
        }
        this.$message.success("添加商品成功!");

        // 编程导航
        this.$router.push("/goods");
      });
    }
  }
};
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
  object-fit: cover;
}
.addItemBtn {
  margin-top: 20px;
}
</style>